Coating method and coating device of liquid

Abstract

To provide a coating method and a coating device of liquid which can suppress emission of a gas component from liquid.SOLUTION: A coating device 9 comprises: a storage part 1 storing target liquid S; and an injection part 3 which injects coating liquid C being liquid having a smaller specific gravity than the target liquid S into the storage part 1. The coating device 9 coats a liquid surface of the target liquid S stored in the storage part 1 by the coating liquid C injected from an injection port 32 of the injection part 3. Coating the liquid surface of the target liquid S by the coating liquid C can suppress dispersion of a gas component emitted from the target liquid S into a surrounding area.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method and apparatus for coating a liquid to suppress the emission of gaseous components, such as odors, from the liquid. [Background technology]

[0002] Devices and methods have been proposed for suppressing the release of gaseous components such as odors from liquids. For example, Patent Document 1 proposes a method of directly covering the water surface with a lid made of urethane foam. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 54-10058 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above method, when adding impurities to the liquid or pouring in additional liquid, the lid must be removed, which creates the problem that gas components are released from the liquid when the lid is removed.

[0005] An object of the present invention is to provide a liquid coating method and coating apparatus capable of suppressing the release of gas components from the liquid. [Means for solving the problem]

[0006] A coating method according to a first aspect of the present invention is characterized in that a coating liquid having a lower specific gravity than a target liquid is injected into the liquid surface of the target liquid, thereby coating the liquid surface of the target liquid with the coating liquid.

[0007] In the coating method according to the first aspect, the liquid surface of the target liquid is covered with the coating liquid, thereby suppressing the release of gas components emitted from the target liquid. By covering the target liquid with the liquid coating liquid, impurities introduced into the target liquid and additional target liquid injected can easily pass through the coating liquid. Therefore, even when additional impurities are introduced into the target liquid or additional target liquid is injected, the effect of the coating liquid in suppressing the release of gas components can be stably maintained.

[0008] In the first embodiment, the coating liquid may contain microorganisms capable of decomposing impurities contained in the target liquid. In this case, the coating liquid can decompose impurities contained in the target liquid while suppressing the release of gas components by covering the liquid surface of the target liquid. In addition, the target liquid and the coating liquid can be prevented from mixing with each other at the interface between them.

[0009] In the first embodiment, the specific gravity of the coating liquid may be 95% or less of the specific gravity of the target liquid. In this case, the target liquid and the coating liquid can be prevented from mixing. Therefore, the liquid surface of the target liquid can be appropriately covered with the coating liquid.

[0010] In the first embodiment, the microorganisms may include at least one of Bacillus subtilis var. natto, yogurt bacteria, and baker's yeast. In this case, impurities contained in the target liquid can be appropriately decomposed by the microorganisms in the coating liquid.

[0011] A coating device according to a second aspect of the present invention comprises a storage section for storing a target liquid, and a first injection port for injecting a coating liquid, which is a liquid having a smaller specific gravity than the target liquid, into the storage section, and is characterized in that the coating liquid injected from the first injection port covers the liquid surface of the target liquid stored in the storage section.

[0012] In the second embodiment, the coating device can suppress the release of gas components emitted from the target liquid by covering the liquid surface of the target liquid with the coating liquid. By covering the target liquid with the liquid coating liquid, impurities added to the target liquid or additional target liquid injected can easily pass through the coating liquid. Therefore, even when impurities are added to the target liquid or additional target liquid is injected, the effect of the coating liquid to suppress the release of gas components can be stably maintained.

[0013] In the second embodiment, a second inlet for injecting the target liquid into the target liquid stored in the storage section may be provided. In this case, the coating device can additionally inject the target liquid into the target liquid coated with the coating liquid.

[0014] In the second aspect, the coating apparatus may further include an input unit that inputs impurities into the target liquid stored in the storage unit. In this case, the coating apparatus is capable of inputting impurities into the target liquid coated with the coating liquid.

[0015] In the second aspect, the coating liquid may contain microorganisms capable of decomposing impurities contained in the target liquid, in which case the same effects as in the first aspect can be achieved.

[0016] In the second aspect, the specific gravity of the coating liquid may be 95% or less of the specific gravity of the target liquid, in which case the same effects as in the first aspect can be achieved.

[0017] In the second aspect, the microorganism may include at least one of Bacillus subtilis var. natto, yogurt bacteria, and baker's yeast. In this case, the same effects as those in the first aspect can be achieved. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram for explaining an outline of a coating method. [Diagram 2] FIG. 2 is a diagram showing an overview of a coating device 9. [Diagram 3]FIG. 2 is a diagram showing a state in which a subject liquid S and a coating liquid C are poured into a storage section 1. [Figure 4] 1 is a diagram showing a state in which the liquid surface of a target liquid S is covered with a coating liquid C. FIG. [Diagram 5] FIG. 13 is a diagram showing how an impurity d is decomposed by microorganisms in a coating liquid C. [Figure 6] 1 is a diagram showing a state in which an impurity d is additionally added to a storage section 1. FIG. [Figure 7] 13 is a diagram showing a state in which the target liquid S is additionally poured into the storage section 1. FIG. [Figure 8] 13 is a diagram showing a state in which the liquid surface of the target liquid S is covered with the coating liquid C after the impurities d and the target liquid S are added. [Figure 9] 1 is a photograph showing experimental result 1 (before and after injection of coating liquid). [Figure 10] 13 is a photograph showing experimental result 2 (change over time after injection of the coating liquid). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] An embodiment of a coating apparatus 9 and a method for coating a target liquid S with a coating liquid C according to the present invention will be described with reference to the drawings. The drawings are used to explain technical features that can be adopted by the present invention. The configuration of the described apparatus is merely an explanatory example and is not intended to limit the scope of the present invention.

[0020] 1, in the coating method according to the present embodiment, the coating liquid C is poured onto the surface of the target liquid S, thereby coating the surface of the target liquid S with the coating liquid C. With the surface of the target liquid S coated with the coating liquid C, the release of gas components from the target liquid S is suppressed. This makes it possible to suppress the odor of the target liquid S from diffusing into the surroundings.

[0021] The target liquid S includes, for example, waste liquid including sewage discharged from general households, business establishments, factories, etc., as well as waste oil, which is used oil. In the target liquid S, impurities d that are the source of dirt may dissolve or precipitate as solid components. The coating liquid C is a liquid with a specific gravity Gc smaller than the specific gravity Gs of the target liquid S. The coating liquid C includes microorganisms. The microorganisms decompose the impurities d dissolved in the target liquid S and the gas components generated by the deterioration of the impurities d precipitated in the target liquid S. Examples of microorganisms include natto bacteria, yogurt bacteria, and baker's yeast. The specific gravity Gc of the coating liquid C is 95% or less of the specific gravity Gs of the target liquid S, more preferably 92% or less.

[0022] 2, the coating device 9 is used to coat the liquid surface of a target liquid S with a coating liquid C by injecting the coating liquid C onto the liquid surface of the target liquid S. The coating device 9 has a storage unit 1, injection units 2 and 3, and an input unit 4.

[0023] The storage unit 1 stores the target liquid S whose liquid surface is covered with the coating liquid C (see Figs. 4 and 8). The injection unit 2 includes a storage unit 21, an injection port 22, and a plug 23. The target liquid S is stored in the storage unit 21. The injection port 22 is a spout for pouring the target liquid S stored in the storage unit 21 into the storage unit 1. The plug 23 can open and close the injection port 22. The injection unit 3 includes a storage unit 31, an injection port 32, and a plug 33. The coating liquid C is stored in the storage unit 31. The injection port 32 is a spout for pouring the coating liquid C stored in the storage unit 31 into the storage unit 1. The plug 33 can open and close the injection port 32. The input unit 4 includes a storage unit 41, an injection port 42, and a plug 43. The storage unit 41 stores impurities d. The input port 42 is a input port for inputting the impurities d stored in the storage unit 41 into the storage unit 1. The plug 43 is capable of opening and closing the insertion port 42 .

[0024] A method of coating the liquid surface of the target liquid S with the coating liquid C in the storage section 1 using the coating device 9 will be described. As shown in FIG. 3, first, the plug 23 of the injection section 2 is operated to open the injection port 22. As a result, the target liquid S stored in the storage section 21 is injected into the storage section 1 through the injection port 22 (arrow Y1). In addition, the plug 33 of the injection section 3 is operated to open the injection port 32. As a result, the coating liquid C stored in the storage section 31 is injected into the storage section 1 through the injection port 32 (arrow Y2). The order in which the target liquid S and the coating liquid C are injected into the storage section 1 is not particularly limited. Therefore, the target liquid S may be injected first and then the coating liquid C may be injected, or the coating liquid C may be injected first and then the target liquid S may be injected. In addition, the target liquid S and the coating liquid C may be injected simultaneously.

[0025] Immediately after the injection of the target liquid S and the coating liquid C, the solid component impurities d float in the target liquid S. Also, the coating liquid C does not mix with the target liquid S, but exists in the target liquid S in a state separated from the target liquid S. After the injection of the target liquid S, the plug 23 is operated to close the injection port 22. After the injection of the coating liquid C, the plug 33 is operated to close the injection port 32.

[0026] Next, the target liquid S and the coating liquid C are poured into the storage section 1 and then left as is for a certain period of time. As a result, the solid impurities d are precipitated in the target liquid S, as shown in FIG. 4. Also, since the specific gravity Gc of the coating liquid C is smaller than the specific gravity Gs of the target liquid S, the coating liquid C moves upward from within the target liquid S toward the liquid surface of the target liquid S. The coating liquid C covers the liquid surface of the target liquid S.

[0027] As shown in FIG. 5, the impurities d dissolved in the target liquid S near the liquid surface, in other words, the part of the target liquid S adjacent to the coating liquid C, are decomposed by the microorganisms in the coating liquid C. As a result, the purified liquid P not containing the impurities d accumulates in the part of the liquid surface of the target liquid S adjacent to the coating liquid C. Since the purified liquid P is present at the interface between the target liquid S and the coating liquid C, the target liquid S and the coating liquid C do not easily mix even over time. The purified liquid P produced by the microorganisms in the coating liquid C gradually permeates the coating liquid C and mixes with it.

[0028] In addition, impurities d dissolved in the target liquid S or impurities d precipitated in the target liquid S may change over time, generating gaseous components. and then diffuses upward within coating liquid C. The odorous components of the gaseous components are decomposed by microorganisms in coating liquid C as they diffuse within coating liquid C. Therefore, the odor of the gaseous components passing through coating liquid C is suppressed more than before the odorous components were decomposed by microorganisms. Therefore, even if the gaseous components that have passed through coating liquid C are dissipated into the surroundings, it does not cause an odor problem.

[0029] In addition, in the coating device 9, while the liquid level of the target liquid S is covered with the coating liquid C, it is possible to operate the plug 43 of the input section 4 to additionally input solid component impurities d into the storage section 1 (see arrow Y3 in FIG. 6), or to operate the plug 23 of the injection section 2 to additionally input the target liquid S into the storage section 1 (see arrow Y4 in FIG. 7). By additionally inputting the impurities d or the target liquid S, the impurities d and the target liquid S pass downward through the coating liquid C. Thereafter, the liquid level of the target liquid S is covered again with the coating liquid C (see FIG. 8). For this reason, the coating liquid C continues to suppress the emission of gas components to the surroundings that are generated by the deterioration of the impurities d.

[0030] With reference to Figures 9 and 10, the results of an experiment observing the time change in the liquid surface of target liquid S when it was covered with coating liquid C will be described. A solution in which glue was dissolved in water was prepared as target liquid S. The glue corresponds to impurity d. A solution in which the microorganisms Bacillus subtilis natto, yogurt bacteria, and baker's yeast were dissolved in water was prepared as coating liquid C. Coating liquid C was injected into target liquid S.

[0031] As shown in Figure 9, immediately after the coating liquid C was injected into the target liquid S, the state in which the liquid surface of the target liquid S was covered with the coating liquid C was observed. Furthermore, as shown in Figure 10, the state in which the liquid surface of the target liquid S was covered with the coating liquid C was stably maintained even after at least 35 days had passed since the coating liquid C was injected into the target liquid S. Therefore, it was revealed that the liquid surface of the target liquid S was stably covered with the coating liquid C for a long period of time.

[0032] Furthermore, as shown in Figure 10, it was found that when time has passed since the coating liquid C was injected into the target liquid S, a brown layer appears at the interface between the target liquid S and the coating liquid C. It is presumed that this layer is caused by the microorganisms contained in the coating liquid C dying after decomposing the impurity d (glue). This revealed that the impurity d in the target liquid S is decomposed by the microorganisms in the coating liquid C at the interface between the target liquid S and the coating liquid C.

[0033] As described above, according to the coating method of this embodiment, by covering the liquid surface of the target liquid S with the coating liquid C, it is possible to suppress the emission of gas components emitted from the target liquid S to the surroundings. Note that by covering the liquid surface of the target liquid S with the liquid coating liquid C, impurities d additionally added to the target liquid S or the target liquid S additionally injected can easily pass through the coating liquid C. Therefore, even when impurities d are additionally added to the target liquid S or the target liquid S is additionally injected, the effect of the coating liquid C in suppressing the emission of gas components can be stably maintained.

[0034] The coating liquid C contains microorganisms capable of decomposing the impurity d contained in the target liquid S. In this case, the coating liquid C covers the liquid surface of the target liquid, thereby suppressing the emission of gas components and decomposing the impurity d contained in the target liquid S. In addition, by storing the purified liquid P that does not contain the impurity d in the portion of the liquid surface of the target liquid S adjacent to the coating liquid C, it is possible to suppress the target liquid S and the coating liquid C from mixing with each other at the interface between them.

[0035] The specific gravity Gc of the coating liquid C is 95% or less, more preferably 92%, of the specific gravity Gs of the target liquid S. In this case, it is possible to prevent the target liquid S and the coating liquid C from mixing. Therefore, the liquid surface of the target liquid S can be appropriately covered by the coating liquid C.

[0036] The microorganisms contained in the coating liquid C are any of natto bacteria, yogurt bacteria, and baker's yeast. In this case, the impurities d contained in the target liquid S can be appropriately decomposed by the microorganisms in the coating liquid C.

[0037] The coating device 9 can suppress the emission of gas components emitted from the target liquid S by covering the liquid surface of the target liquid S stored in the storage unit 1 with the coating liquid C injected from the injection unit 3. By covering the target liquid S with the liquid coating liquid C, impurities d added to the target liquid S in the storage unit 1 and target liquid S additionally injected into the storage unit 1 can easily pass through the coating liquid C. Therefore, even when impurities d are additionally added to the target liquid S in the storage unit 1 or when target liquid S is additionally injected into the storage unit 1, the effect of the coating liquid C in suppressing the emission of gas components can be stably maintained.

[0038] The coating device 9 includes an injection unit 2 that injects additional target liquid S into the target liquid S stored in the storage unit 1. Therefore, the coating device 9 can inject additional target liquid S into the target liquid S whose liquid surface is covered with the coating liquid C in the storage unit 1.

[0039] The coating device 9 includes an input unit 4 that inputs impurities d to the target liquid S stored in the storage unit 1. Therefore, the coating device 9 can input impurities d to the target liquid S coated with the coating liquid C in the storage unit 1.

[0040] The present invention is not limited to the above embodiment, and various modifications are possible. The above coating method is not limited to being performed using the coating device 9. If the liquid surface of the target liquid S is coated with the coating liquid C, the method may be performed without using the coating device 9.

[0041] The specific example of the microorganism contained in the coating liquid C is an example, and other microorganisms capable of decomposing the impurity d may be contained. For example, nitrite bacteria, nitrate bacteria, Opercularia, Corella, etc. may be used. The coating liquid C may not contain microorganisms. The specific gravity of the coating liquid C with respect to the target liquid S is an example, and other values ​​may be used.

[0042] The coating device 9 may have only the injection part 3 out of the injection parts 2 and 3, and may not be provided with the injection part 2. The coating device 9 may not be provided with the input part 4.

[0043] The injection port 32 is an example of the "first injection port" of the present invention. The injection port 22 is an example of the "second injection port" of the present invention. [Explanation of symbols]

[0044] 1: Storage section 2, 3: Injection part 4: Insertion section 9: Covering device C: Coating liquid S: Target liquid d: impurities

Claims

1. A liquid coating method for coating a surface of a target liquid with a coating liquid having a smaller specific gravity than the target liquid by injecting the coating liquid into the surface of the target liquid.

2. 2. The liquid coating method according to claim 1, wherein the coating liquid contains microorganisms capable of decomposing impurities contained in the target liquid.

3. 2. The liquid coating method according to claim 1, wherein the specific gravity of the coating liquid is 95% or less of the specific gravity of the target liquid.

4. 3. The liquid coating method according to claim 2, wherein the microorganisms include at least one of Bacillus subtilis var. natto, Bacillus yogurt and Bread yeast.

5. A storage unit for storing the target liquid; a first inlet for injecting a coating liquid, which is a liquid having a smaller specific gravity than the target liquid, into the storage portion; Equipped with a coating device for coating a surface of the target liquid stored in the storage portion with the coating liquid injected from the first injection port.

6. 6. The coating apparatus according to claim 5, further comprising a second inlet for injecting the target liquid into the target liquid stored in the storage section.

7. 6. The coating apparatus according to claim 5, further comprising an input section for inputting impurities into the target liquid stored in the storage section.

8. 6. The coating apparatus according to claim 5, wherein the coating liquid contains microorganisms capable of decomposing impurities contained in the target liquid.

9. 6. The coating apparatus according to claim 5, wherein the specific gravity of the coating liquid is 95% or less of the specific gravity of the target liquid.

10. 9. The coating device according to claim 8, wherein the microorganisms include at least one of Bacillus subtilis var. natto, Bacillus yogurt, and Bread yeast.

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